22021598181 has 16 divisors (see below), whose sum is σ = 32033908800. Its totient is φ = 13345384320.

The previous prime is 22021598167. The next prime is 22021598233. The reversal of 22021598181 is 18189512022.

It is not a de Polignac number, because 22021598181 - 2⁵ = 22021598149 is a prime.

It is a super-2 number, since 2×22021598181² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021598881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 754345 + ... + 782993.

It is an arithmetic number, because the mean of its divisors is an integer number (2002119300).

Almost surely, 2^22021598181 is an apocalyptic number.

It is an amenable number.

22021598181 is a deficient number, since it is larger than the sum of its proper divisors (10012310619).

22021598181 is a wasteful number, since it uses less digits than its factorization.

22021598181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51956.

The product of its (nonzero) digits is 23040, while the sum is 39.

The spelling of 22021598181 in words is "twenty-two billion, twenty-one million, five hundred ninety-eight thousand, one hundred eighty-one".